TWI454729B - Optical imaging lens and the application of the lens of the electronic device - Google Patents

Description

Optical imaging lens and electronic device using the same

The present invention relates to an optical lens, and more particularly to an optical imaging lens and an electronic device using the same.

In recent years, the popularity of portable electronic products such as mobile phones and digital cameras has led to the development of imaging modules (mainly including optical imaging lenses, module holder units and sensors). The thin and light trend of mobile phones and digital cameras has also made the demand for miniaturization of image modules more and more high, with Charge Coupled Device (CCD) or Complementary Metal-Oxide (Complementary Metal-Oxide). The technological advancement and size reduction of Semiconductor (referred to as CMOS), the optical imaging lens loaded in the image module also needs to be shortened accordingly, but in order to avoid the photographic effect and quality degradation, it is still necessary to shorten the length of the optical imaging lens. Both good optical performance.

U.S. Patent Publication Nos. 20120154929, 20100253829, 20100254029, U.S. Patent Publication No. 8305697, 8339718, Japanese Patent Publication Nos. 2010-026434, 2010-256608, all of which are five-piece lens structures and the air gaps between the lenses are combined. is too big.

Among them, U.S. Patent Publication No. 20100254029 has a lens length of 10 mm or more, which is disadvantageous for the thin design of portable electronic products such as mobile phones and digital cameras.

The imaging lens disclosed in the above patent has a long lens length, and does not meet the demand for miniaturization of the mobile phone, so there is still room for improvement.

Accordingly, it is an object of the present invention to provide an optical imaging lens capable of maintaining good optical performance while shortening the length of the lens system.

Therefore, the optical imaging lens of the present invention sequentially includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens along an optical axis from the object side to the image side, and the first The lens to the fifth lens each include an object side facing the object side and passing the imaging light and an image side facing the image side and passing the imaging light.

The image side of the first lens has a convex portion located in the vicinity of the circumference. The object side of the second lens has a concave portion located in the vicinity of the circumference, and the image side of the second lens has a convex portion located in the vicinity of the circumference. The object side of the third lens has a concave portion located in the vicinity of the circumference. The fourth lens is a positive refractive power lens, and the object side surface of the fourth lens has a concave surface located in a region near the optical axis. The fifth lens is made of plastic.

An advantageous effect of the optical imaging lens of the present invention is that the image side of the first lens has the convex portion located in the vicinity of the circumference, Helps the optical imaging lens to condense. The object side surface of the second lens has the concave portion located in the vicinity of the circumference, the image side surface of the second lens has a convex portion located in the vicinity of the circumference, and the object side surface of the third lens has a region near the circumference This concave surface can contribute to correcting the aberration of the edge. The fourth lens is a positive refractive power lens, which can share the refractive index of the optical imaging lens, and the object side surface of the fourth lens has the concave surface located in the vicinity of the optical axis, which can help correct the aberration . In addition, the material of the fifth lens is plastic, which can reduce the manufacturing cost and reduce the weight of the optical imaging lens. In general, it is also advantageous to shorten the length of the imaging lens.

Accordingly, another object of the present invention is to provide an electronic device applied to the aforementioned optical imaging lens.

Thus, the electronic device of the present invention comprises a casing and an image module mounted in the casing.

The image module includes an optical imaging lens as described above, a lens barrel for the optical imaging lens, a module rear seat unit for the lens barrel, and a optical imaging device. Image sensor on the side of the lens image.

The electronic device of the present invention has the beneficial effects of: loading the image module having the optical imaging lens described above in the electronic device, so that the optical imaging lens can provide good optical performance under the condition of shortening the length of the system. The advantage is that the thinner and lighter electronic device can be produced without sacrificing the optical performance, so that the invention has good practical performance and contributes to the structural design of light, thin and short, and can meet the higher quality consumer demand.

10‧‧‧Optical imaging lens

2‧‧‧ aperture

3‧‧‧first lens

31‧‧‧ ‧ side

32‧‧‧like side

321‧‧‧ convex face

322‧‧‧ concave face

4‧‧‧second lens

41‧‧‧ ‧ side

411‧‧‧ concave face

412‧‧‧ concave face

42‧‧‧like side

421‧‧‧ convex face

5‧‧‧ third lens

51‧‧‧ ‧ side

511‧‧‧ convex face

512‧‧‧ concave face

513‧‧‧ concave face

52‧‧‧like side

521‧‧‧ concave face

522‧‧‧ convex face

6‧‧‧Fourth lens

61‧‧‧ ‧ side

611‧‧‧ concave face

62‧‧‧like side

621‧‧‧ convex face

622‧‧‧ concave face

623‧‧‧ convex face

7‧‧‧ fifth lens

71‧‧‧ ‧ side

711‧‧ ‧ convex face

712‧‧‧ concave face

72‧‧‧like side

721‧‧‧ concave face

722‧‧‧ convex face

8‧‧‧Filter

81‧‧‧ ‧ side

82‧‧‧like side

9‧‧‧ imaging surface

I‧‧‧ optical axis

1‧‧‧Electronic device

11‧‧‧Shell

12‧‧‧Image Module

120‧‧‧Modular rear seat unit

121‧‧‧Lens rear seat

122‧‧‧Image sensor rear seat

123‧‧‧First body

124‧‧‧Second body

125‧‧‧ coil

126‧‧‧ Magnetic components

130‧‧‧Image Sensor

21‧‧‧Mirror tube

II, III‧‧‧ axis

Other features and advantages of the present invention will be apparent from the detailed description of the preferred embodiments illustrated in the accompanying drawings in which: FIG. A first preferred embodiment of the imaging lens; FIG. 3 is a longitudinal spherical aberration and various aberration diagrams of the first preferred embodiment; and FIG. 4 is a table showing the lenses of the first preferred embodiment. Figure 5 is a table showing the aspherical coefficients of the lenses of the first preferred embodiment; Figure 6 is a schematic view showing a second preferred embodiment of the optical imaging lens of the present invention; 7 is a longitudinal spherical aberration and various aberration diagrams of the second preferred embodiment; FIG. 8 is a table diagram showing optical data of each lens of the second preferred embodiment; FIG. 9 is a table diagram illustrating The aspherical coefficient of each lens of the second preferred embodiment; FIG. 10 is a schematic view showing a third preferred embodiment of the optical imaging lens of the present invention; and FIG. 11 is a longitudinal ball of the third preferred embodiment. Difference and various aberration diagrams; Figure 12 is a table diagram, saying Non FIG. 13 is a table diagram illustrating each lens of the third preferred embodiment; optical data of each lens according to a third preferred embodiment of the FIG. 14 is a schematic view showing a fourth preferred embodiment of the optical imaging lens of the present invention; FIG. 15 is a longitudinal spherical aberration and various aberration diagrams of the fourth preferred embodiment; FIG. FIG. 17 is a table diagram showing the aspherical coefficients of the lenses of the fourth preferred embodiment; FIG. 18 is a schematic view showing the configuration of the optical lens of the lens of the fourth preferred embodiment; A fifth preferred embodiment of the optical imaging lens of the invention; FIG. 19 is a longitudinal spherical aberration and various aberration diagrams of the fifth preferred embodiment; FIG. 20 is a table diagram illustrating the fifth preferred embodiment. Optical data of each lens; FIG. 21 is a table showing the aspherical coefficients of the lenses of the fifth preferred embodiment; FIG. 22 is a table showing the first preferred embodiment of the optical imaging lens to FIG. 23 is a cross-sectional view showing a first preferred embodiment of the electronic device of the present invention; and FIG. 24 is a cross-sectional view showing the electronic device of the present invention. A second preferred embodiment.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

As used herein, "a lens having a positive refractive power (or a negative refractive power)" means that the lens has a positive refractive power (or a negative refractive power) in the vicinity of the optical axis. "The object side (or image side) of a lens has a convex portion (or concave surface) located in a certain area", which means that the area is more parallel to the optical axis than the outer side in the radial direction. In the case of "outwardly convex" (or "inwardly recessed"), FIG. 1 is exemplified, wherein I is an optical axis and the lens is radially symmetric with respect to the optical axis I as an axis of symmetry. The object side has a convex surface in the A area, the B area has a concave surface, and the C area has a convex surface because the A area is more parallel to the optical axis than the outer area (ie, the B area) in the radial direction immediately adjacent to the area. In order to bulge outward, the B region is more inwardly recessed than the C region, and the C region is more outwardly convex than the E region. "Around area around the circumference" refers to the area around the circumference of the surface of the lens that is only for the passage of imaging light, that is, the area C in Fig. 1, wherein the imaging light includes the chief ray Lc and the edge ray (marginal Ray) Lm. The "area near the optical axis" refers to the area near the optical axis of the curved surface through which the imaging light passes, that is, the A area in FIG. In addition, the lens further includes an extension portion E for assembling the lens in an optical imaging lens. The ideal imaging light does not pass through the extension portion E. However, the structure and shape of the extension portion E are not limited thereto. In the following embodiments, the extensions are omitted for the sake of simplicity.

Referring to FIG. 2 and FIG. 4, a first preferred embodiment of the optical imaging lens 10 of the present invention sequentially includes an aperture 2, a first lens 3, and a second lens along an optical axis I from the object side to the image side. 4. A third lens 5, a fourth lens 6, a fifth lens 7, and a filter 8. When a subject to be photographed The emitted light enters the optical imaging lens 10 and passes through the aperture 2, the first lens 3, the second lens 4, the third lens 5, the fourth lens 6, the fifth lens 7, and the filter After the light sheet 8, an image is formed on an image plane 9 (Image Plane). The filter 8 is an IR Cut Filter for preventing infrared rays in the light from being transmitted to the imaging surface 9 to affect image quality. It is added that the object side is the side facing the object to be photographed, and the image side is the side facing the image forming surface 9.

Wherein the first lens 3, the second lens 4, and the third through The mirror 5, the fourth lens 6, the fifth lens 7, and the filter 8 respectively have an object side 31, 41, 51, 61, 71, 81 facing the object side and passing the imaging light, and a The image side faces 32, 42, 52, 62, 72, 82 are directed toward the image side. The side surfaces 31, 41, 51, 61, 71 and the image side surfaces 32, 42, 52, 62, 72 are all aspherical.

In addition, in order to meet the demand for lightweight products, the first through The mirror 3 to the fifth lens 7 are both made of a refractive index and are made of a plastic material, but the material is not limited thereto.

The first lens 3 is a lens of positive refractive power, and the first lens The object side surface 31 of the mirror 3 is a convex surface, and the image side surface 32 of the first lens 3 is convex, and has a convex surface portion 321 located in the vicinity of the circumference.

The second lens 4 is a lens of positive refractive power, and the second lens The object side surface 41 of the mirror 4 is concave and has a concave surface portion 411 located in the vicinity of the optical axis I, and a concave surface portion 412 located in the vicinity of the circumference. The image side surface 42 of the second lens 4 is convex and has a convex portion 421 located in the vicinity of the circumference.

The third lens 5 is a lens of negative refractive power, and the third lens The object side surface 51 of the mirror 5 has a convex portion 511 located in the vicinity of the optical axis I, and a concave portion 512 located in the vicinity of the circumference. The image side surface 52 of the third lens 5 has a concave surface portion 521 located in the vicinity of the optical axis I, and a convex surface portion 522 located in the vicinity of the circumference.

The fourth lens 6 is a lens of positive refractive power, and the fourth lens The object side surface 61 of the mirror 6 is concave and has a concave surface portion 611 located in the vicinity of the optical axis I. The image side surface 62 of the fourth lens 6 has a convex portion 621 located in the vicinity of the optical axis I, and a concave portion 622 located in the vicinity of the circumference.

The fifth lens 7 is a lens of negative refractive power, and the fifth through The object side surface 71 of the mirror 7 has a convex portion 711 located in the vicinity of the optical axis I, and a concave portion 712 located in the vicinity of the circumference. The image side surface 72 of the fifth lens 7 has a concave portion 721 located in the vicinity of the optical axis I, and a convex portion 722 located in the vicinity of the circumference.

Other detailed optical data of the first preferred embodiment are shown in FIG. 4. As shown, the overall system focal length (EFL) of the first preferred embodiment is 2.66 mm, the half field of view (HFOV) is 42.73 degrees, and the aperture value (Fno) is 2.45. Its system length (TTL) is 3.97mm. The length of the system refers to the distance between the object side surface 31 of the first lens 3 and the imaging surface 9 on the optical axis I.

In addition, from the object side surface 31 of the first lens 3 to the image side surface 72 of the fifth lens 7, a total of ten faces are aspherical, and the aspherical surface is defined by the following formula:

Where: R : radius of curvature of the surface of the lens; Z : depth of the aspheric surface (the point on the aspheric surface from the optical axis I is Y , and the tangent plane tangent to the vertex on the aspherical optical axis I, the vertical distance between the two) Y : the vertical distance of the point on the aspherical surface from the optical axis I; K : the conic constant; and a _2i : the 2ith order aspheric coefficient.

The aspherical coefficients of the object side surface 31 of the first lens 3 to the image side surface 72 of the fifth lens 7 in the formula (1) are as shown in FIG.

In addition, the relationship among the important parameters in the optical imaging lens 10 of the first preferred embodiment is: Gaa/G34=1.42; EFL/T2=7.56; EFL/G34=6.73; Gaa/T5=1.08; Gaa/CTmin = 2.34; ALT / Gaa = 3.83; Gaa / T2 = 1.60; wherein T2 is the center thickness of the second lens 4 on the optical axis I; T5 is the center thickness of the fifth lens 7 on the optical axis I; Gaa is the sum of the four air gaps of the first lens 3 to the fifth lens 7 on the optical axis I; G34 is the air gap of the third lens 5 to the fourth lens 6 on the optical axis I; CTmin is The center thickness of all the lenses on the optical axis I is the smallest; ALT is the total thickness of all the lenses on the optical axis I; and the EFL (Effective Focal Length) is the system focal length of the optical imaging lens 10.

Referring to FIG. 3, the drawing of (a) illustrates the longitudinal spherical aberration of the first preferred embodiment, and the drawings of (b) and (c) respectively illustrate the first preferred embodiment. The astigmatism aberration on the imaging surface 9 with respect to the sagittal direction and the astigmatic aberration on the tangential direction, the pattern of (d) illustrates that the first preferred embodiment is Distortion aberration on the imaging surface 9. In the vertical spherical aberration diagram of the first preferred embodiment, in Fig. 3(a), the curves formed by each of the wavelengths are close to each other and approached in the middle, indicating that each of the off-axis rays of different wavelengths at different heights is concentrated in the imaging. In the vicinity of the point, it can be seen from the deflection amplitude of the curve of each wavelength that the deviation of the imaging point of the off-axis rays of different heights is controlled within the range of ±0.025 mm, so this embodiment does significantly improve the spherical aberration of the same wavelength, and The distances between the three representative wavelengths are also controlled within the range of ±0.025 mm, and the imaging positions representing the different wavelengths of light are quite concentrated, so that the chromatic aberration is also significantly improved.

In the two astigmatic aberration diagrams of Figures 3(b) and 3(c), the focal length variation of the three representative wavelengths over the entire field of view falls within ±0.075 mm.

It is to be noted that the optical system of the first preferred embodiment can effectively eliminate aberrations. The distortion aberration diagram of FIG. 3(d) shows that the distortion aberration of the first preferred embodiment is maintained within ±1.7%, indicating that the distortion aberration of the first preferred embodiment has been conformed to the optical system. According to the imaging quality requirement, the first preferred embodiment can provide better imaging quality under the condition that the length of the system has been shortened to 3.97 mm compared with the prior optical lens. For example, the lens length can be shortened to maintain a thinner product design while maintaining good optical performance.

Referring to Figure 6, a second preferred embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first preferred embodiment. The main difference between the second preferred embodiment and the first preferred embodiment is that the object side surface 51 of the third lens 5 is concave and has a concave surface 513 located in the vicinity of the optical axis I. And a concave portion 512 located in the vicinity of the circumference. The image side surface 62 of the fourth lens 6 is convex, and has a convex portion 621 located in the vicinity of the optical axis I, and a convex portion 623 located in the vicinity of the circumference.

The detailed optical data is shown in FIG. 8. The overall system of the second preferred embodiment has a focal length of 2.50 mm, a half angle of view (HFOV) of 44.86 degrees, an aperture value (Fno) of 2.45, and a system length (TTL). It is 3.84mm.

As shown in FIG. 9, the aspherical coefficients in the formula (1) are the object side surface 31 of the first lens 3 of the second preferred embodiment to the image side surface 72 of the fifth lens 7.

In addition, the relationship among the important parameters in the optical imaging lens 10 of the second embodiment is: Gaa/G34=3.06; EFL/T2=6.44; EFL/G34=10.71; Gaa/T5=1.35; Gaa/CTmin=2.22; ALT/Gaa=3.11; and Gaa/T2=1.84.

Referring to FIG. 7, the second preferred embodiment and the first embodiment can be seen from the longitudinal spherical aberration of (a), the astigmatic aberration of (b), (c), and the distortion aberration pattern of (d). As in the preferred embodiment, the curves of the three representative wavelengths of the resulting longitudinal spherical aberration are also relatively close to each other, and the second preferred embodiment also effectively eliminates longitudinal spherical aberration and has significantly improved chromatic aberration. However, in the astigmatic aberration obtained by the second preferred embodiment, the amount of change in the focal length of the three representative wavelengths in the entire field of view angle also falls within the range of ±0.15 mm, and the distortion aberration is also maintained at ± In the range of 2.25%, the same imaging quality can be provided under the condition that the length of the system has been shortened to 3.84 mm, so that the second preferred embodiment can shorten the lens length while maintaining good optical performance. Conducive to thin product design.

Referring to FIG. 10, a third preferred embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first preferred embodiment. Only the lens center thickness of each lens is more or less than the air gap. different.

The detailed optical data is as shown in FIG. 12. The overall system of the third preferred embodiment has a focal length of 2.85 mm, a half angle of view (HFOV) of 40.74°, an aperture value (Fno) of 2.45, and a system length (TTL). It is 4.16mm.

As shown in FIG. 13, the object side surface 31 of the first lens 3 of the third preferred embodiment to the image side surface 72 of the fifth lens 7 has various aspherical coefficients in the formula (1).

In addition, the relationship among the important parameters in the optical imaging lens 10 of the third preferred embodiment is: Gaa/G34=1.88; EFL/T2=8.52; EFL/G34=8.03; Gaa/T5=1.48; Gaa/ CTmin = 2.18; ALT/Gaa = 3.14; and Gaa/T2 = 1.99.

Referring to FIG. 11, the third preferred embodiment and the first embodiment can be seen from the longitudinal spherical aberration of (a), the astigmatic aberration of (b), (c), and the distortion aberration pattern of (d). As in the preferred embodiment, the curves of the three representative wavelengths of the resulting longitudinal spherical aberration are also relatively close to each other. The third preferred embodiment also effectively eliminates longitudinal spherical aberration and has significantly improved chromatic aberration. In the astigmatic aberration obtained by the third preferred embodiment, the amount of change in the focal length of the three representative wavelengths in the entire field of view angle also falls within the range of ±0.1 mm, and the distortion aberration is also maintained at ± In the range of 2.25%, the same imaging quality can be provided under the condition that the system length has been shortened to 4.16 mm, so that the third preferred embodiment can shorten the lens length while maintaining good optical performance. Conducive to thin product design.

Referring to FIG. 14, a fourth embodiment of the optical imaging lens 10 of the present invention is shown. The preferred embodiment is substantially similar to the first preferred embodiment. The main difference between the fourth preferred embodiment and the first preferred embodiment is that the image side 32 of the first lens 3 has a concave surface 322 located in the vicinity of the optical axis I, and a A convex portion 321 in the vicinity of the circumference.

The detailed optical data is as shown in FIG. 16. The overall system focal length of the fourth preferred embodiment is 2.60 mm, the half angle of view (HFOV) is 43.28, the aperture value (Fno) is 2.45, and the system length (TTL) is It is 3.97mm.

As shown in FIG. 17, the aspherical coefficients in the formula (1) are the object side surface 31 of the first lens 3 of the fourth preferred embodiment to the image side surface 72 of the fifth lens 7.

In addition, the relationship among the important parameters in the optical imaging lens 10 of the fourth preferred embodiment is: Gaa/G34=1.86; EFL/T2=7.43; EFL/G34=7.43; Gaa/T5=1.26; Gaa/ CTmin = 2.17; ALT / Gaa = 3.30; and Gaa / T2 = 1.86.

Referring to FIG. 15, the fourth preferred embodiment and the first can be seen from the longitudinal spherical aberration of (a), the astigmatic aberration of (b), (c), and the distortion aberration diagram of (d). In the same manner as the preferred embodiment, the curves of the three representative wavelengths of the obtained longitudinal spherical aberration are also relatively close to each other, and the fourth preferred embodiment also effectively eliminates the longitudinal spherical aberration and has a significantly improved chromatic aberration. And the fourth best In the astigmatic aberration obtained by the example, the amount of change in the focal length of the three representative wavelengths in the entire field of view angle also falls within the range of ±0.2 mm, and the distortion aberration is also maintained within the range of ±2.25%. It is also possible to provide better image quality under the condition that the length of the system has been shortened to 3.97 mm, so that the fourth preferred embodiment can shorten the lens length while maintaining good optical performance, and is advantageous for thin product design. .

Referring to FIG. 18, it is a fifth of the optical imaging lens 10 of the present invention. The preferred embodiment is substantially similar to the first preferred embodiment. The main difference between the fifth preferred embodiment and the first preferred embodiment is that the object side surface 51 of the third lens 5 is concave and has a concave surface 513 located in the vicinity of the optical axis I. And a concave portion 512 located in the vicinity of the circumference. The image side surface 62 of the fourth lens 6 is convex, and has a convex portion 621 located in the vicinity of the optical axis I, and a convex portion 623 located in the vicinity of the circumference.

The detailed optical data is shown in Figure 20, the fifth best The overall system focal length of the example is 2.95 mm, the half angle of view (HFOV) is 39.67°, the aperture value (Fno) is 2.45, and the system length (TTL) is 4.28 mm.

As shown in FIG. 21, the first of the fifth preferred embodiment is The object side surface 31 of the lens 3 to the image side surface 72 of the fifth lens 7 has various aspherical coefficients in the formula (1).

In addition, the optical imaging lens 10 of the fifth preferred embodiment The relationship between the important parameters is: Gaa/G34=2.26; EFL/T2=9.56; EFL/G34 = 10.93; Gaa/T5 = 1.43; Gaa/CTmin = 1.98; ALT/Gaa = 3.49; and Gaa/T2 = 1.98.

Referring to FIG. 19, the fifth preferred embodiment and the first can be seen from the longitudinal spherical aberration of (a), the astigmatic aberration of (b), (c), and the distortion aberration diagram of (d). In a preferred embodiment, the three representative wavelength curves of the longitudinal spherical aberration obtained are also relatively close to each other. The fifth preferred embodiment also effectively eliminates longitudinal spherical aberration and has significantly improved chromatic aberration. However, in the astigmatic aberration obtained by the fifth preferred embodiment, the focal length variation of the three representative wavelengths in the entire field of view angle also falls within the range of ±0.05 mm, and the distortion aberration is also maintained at ± In the range of 2.25%, the same imaging quality can be provided under the condition that the system length has been shortened to 4.28 mm, so that the fifth preferred embodiment can shorten the lens length while maintaining good optical performance. Conducive to thin product design.

Referring again to FIG. 22, which is a table diagram of the optical parameters of the above five preferred embodiments, when the relationship between the optical parameters in the optical imaging lens 10 of the present invention satisfies the following conditional formula, the system length is shortened. In this case, there will still be better optical performance, so that when the present invention is applied to a related portable electronic device, a thinner product can be produced: Gaa/G34≦4.0---------- -------------(2)

EFL/T2≦9.7----------------------(3)

Gaa/T2≦2.0------------------------(4)

Gaa/T5≦2.1----------------------(5)

Gaa/CTmin≦2.5--------------------(6)

EFL/G34≦11---------------------(7)

3.1≦ALT/Gaa--------------------(8)

In the process of shortening the optical imaging lens, the total of all the air gaps will be reduced, and because the object side surface 61 of the fourth lens 6 has the concave surface portion 611 located in the vicinity of the optical axis I, and the third Since the air gap between the lenses 5 is confined by the congenital reduction, the ratio which can be shortened is small, so the conditional expression (2) is satisfied. Preferably, when Gaa/G34≦2 is satisfied, G34 is larger at this time, so assembly is easier, and the conditional expression can be limited by a lower limit: 1≦Gaa/G34≦4.

In the process of shortening the optical imaging lens, the EFL will be reduced, and the thickness of the second lens 4 is usually made thin. Considering the ease of manufacture, the thickness of the lens cannot be reduced without limitation. When the conditional expression (3) is satisfied, a preferred configuration is obtained. Preferably, 7≦EFL/T2≦9.7 is satisfied. In addition, this conditional expression can be limited by a lower limit: 6 ≦ EFL / T2 ≦ 9.7.

In the process of shortening the optical imaging lens, the total of all the air gaps will be reduced, and the thickness of the second lens 4 is usually made thin. Considering the ease of manufacture, it cannot be unrestrictedly thin. Therefore, when the conditional expression (4) is satisfied, a better configuration is obtained. In addition, this conditional expression can be limited by a lower limit: 1 ≦ Gaa / T2 ≦ 2.

In the process of shortening the optical imaging lens, the total of all the air gaps will be reduced, and the fifth lens 7 is optically effective. Since the other lens is large, the fifth lens 7 can be shortened in a small proportion, and when the conditional expression (5) is satisfied, a better configuration is obtained. In addition, this conditional expression can be limited by a lower limit: 1 ≦ Gaa / T5 ≦ 2.1.

All air gaps during the shortening of the optical imaging lens The general assembly will have a narrowing trend, and the thickness of the lens is not limited to thinning in consideration of manufacturing difficulty, so the minimum lens thickness has a shortening limit, so when the condition (6) is satisfied , there will be better configuration. In addition, this conditional expression can be limited by a lower limit: 1.5 ≦ Gaa / CTmin ≦ 2.5.

In the process of shortening the optical imaging lens, the EFL will follow Small, and because the object side surface 61 of the fourth lens 6 has the concave surface portion 611 located in the vicinity of the optical axis I, the air gap between the third lens 6 and the third lens 5 has a confined reduction limit, so it can be shortened. The ratio is small, so that the conditional expression (7) is satisfied, and preferably, EFL/G34 ≦ 7.5 is satisfied. In addition, this conditional expression can be limited by an upper limit: 6 ≦ EFL / G34 ≦ 11.

During the shortening of the lens length, Gaa and all lenses The thickness of the total ALT will be smaller and smaller, considering the difficulty of production, when the condition (8) is satisfied, ALT and Gaa will have a better configuration. In addition, this conditional expression can be limited by an upper limit: 3.1 ≦ ALT / Gaa ≦ 4.2.

In summary, the optical imaging lens 10 of the present invention can achieve the following effects and advantages, and thus achieve the object of the present invention:

1. The image side surface 32 of the first lens 3 has the convex surface portion 321 located in the vicinity of the circumference, which can help the optical imaging lens 10 to collect light.

2. The object side surface 41 of the second lens 4 is located The concave surface portion 412 of the region near the circumference, the image side surface 42 of the second lens 4 has a convex surface portion 421 located in the vicinity of the circumference, and the object side surface 51 of the third lens 5 has the concave surface portion 512 located in the vicinity of the circumference. Can help correct aberrations at the edges.

Third, the fourth lens 6 is a lens with positive refractive power, When the refractive power of the optical imaging lens 10 is shared, and the object side surface 61 of the fourth lens 6 has the concave surface portion 611 located in the vicinity of the optical axis I, it can contribute to the correction of the aberration.

4. The material of the fifth lens 7 is plastic, which can be reduced. Manufacturing costs and weight reduction of the optical imaging lens 10.

5. The invention is controlled by related design parameters, for example Gaa/G34, EFL/T2, Gaa/T2, Gaa/T5, Gaa/CTmin, EFL/G34, and ALT/Gaa parameters make the whole system better to eliminate aberrations, such as the ability to eliminate spherical aberration. Further, the optical imaging lens 10 is designed and arranged in conjunction with the concave-convex shape of the lenses 3, 4, 5, 6, and 7 side faces 31, 41, 51, 61, 71 or the image side faces 32, 42, 52, 62, and 72. Under the condition of shortening the length of the system, it still has optical performance capable of effectively overcoming chromatic aberration and provides better image quality.

6. According to the description of the above five preferred embodiments, the present invention is shown The design of the optical imaging lens 10 can be shortened to less than 5 mm in the preferred embodiment. Compared with the existing optical imaging lens, the lens of the present invention can be used to manufacture a thinner product. The invention has economic benefits in line with market demand.

Referring to FIG. 23, the application of the optical imaging lens 10 described above is applied. In a first preferred embodiment of the sub-device 1, the electronic device 1 includes a casing 11 and an image module 12 mounted in the casing 11. The electronic device 1 is described here by taking only a mobile phone as an example, but the type of the electronic device 1 is not limited thereto.

The image module 12 includes the optical imaging mirror as described above a head 10, a lens barrel 21 for the optical imaging lens 10, a module rear seat unit 120 for the lens barrel 21, and image sensing disposed on the image side of the optical imaging lens 10 130. The imaging surface 9 (see FIG. 2) is formed on the image sensor 130.

The module rear seat unit 120 has a lens rear seat 121, and a The image sensor rear seat 122 is disposed between the lens rear seat 121 and the image sensor 130. The lens barrel 21 is disposed coaxially with the lens rear seat 121 along an axis II, and the lens barrel 21 is disposed inside the lens rear seat 121.

Referring to FIG. 24, the application of the optical imaging lens 10 described above is applied. A second preferred embodiment of the sub-device 1, the main difference between the second preferred embodiment and the electronic device 1 of the first preferred embodiment is that the module rear seat unit 120 is a voice coil motor (VCM). ) type. The lens rear seat 121 has a first seat body 123 disposed on the outer side of the lens barrel 21 and disposed along an axis III, and a second seat body disposed along the axis III and surrounding the outer side of the first seat body 123. 124. A coil 125 disposed between the outer side of the first base 123 and the inner side of the second base 124, and a magnetic element 126 disposed between the outer side of the coil 125 and the inner side of the second base 124.

The first seat 123 of the lens rear seat 121 can carry the lens barrel 21 and the optical imaging lens 10 disposed in the lens barrel 21 are moved along the axis III. The image sensor rear seat 122 is in contact with the second base 124. The infrared filter 8 is disposed on the rear seat 122 of the image sensor. Other components of the second preferred embodiment of the electronic device 1 are similar to those of the electronic device 1 of the first preferred embodiment, and are not described herein again.

By mounting the optical imaging lens 10, due to the optical imaging The system length of the lens 10 can be effectively shortened, so that the thickness of the first preferred embodiment and the second preferred embodiment of the electronic device 1 can be relatively reduced to produce a thinner product, and still provide good optics. The performance and imaging quality, thereby making the electronic device 1 of the present invention have the economic benefits of reducing the amount of material used in the casing, and can also meet the design trend and consumer demand of thin and light products.

However, the above is only the preferred embodiment of the present invention. The scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the present invention in the scope of the invention and the scope of the patent specification are still within the scope of the invention.

10‧‧‧Optical imaging lens

2‧‧‧ aperture

3‧‧‧first lens

31‧‧‧ ‧ side

32‧‧‧like side

321‧‧‧ convex face

4‧‧‧second lens

41‧‧‧ ‧ side

411‧‧‧ concave face

412‧‧‧ concave face

42‧‧‧like side

421‧‧‧ convex face

5‧‧‧ third lens

51‧‧‧ ‧ side

511‧‧‧ convex face

512‧‧‧ concave face

52‧‧‧like side

521‧‧‧ concave face

522‧‧‧ convex face

6‧‧‧Fourth lens

61‧‧‧ ‧ side

611‧‧‧ concave face

62‧‧‧like side

621‧‧‧ convex face

622‧‧‧ concave face

7‧‧‧ fifth lens

71‧‧‧ ‧ side

711‧‧ ‧ convex face

712‧‧‧ concave face

72‧‧‧like side

721‧‧‧ concave face

722‧‧‧ convex face

8‧‧‧Filter

81‧‧‧ ‧ side

82‧‧‧like side

9‧‧‧ imaging surface

I‧‧‧ optical axis

Claims (13)

An optical imaging lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens along an optical axis from the object side to the image side, and the first lens is The fifth lens includes an object side facing the object side and passing the imaging light and an image side facing the image side and passing the imaging light: the image side of the first lens has a convex surface located in the vicinity of the circumference; The object side of the second lens has a concave portion located in the vicinity of the circumference, the image side of the second lens has a convex portion located in the vicinity of the circumference; and the object side of the third lens has a region near the circumference a concave surface; the fourth lens is a positive refractive power lens, and the object side of the fourth lens has a concave surface located in a region near the optical axis; and the fifth lens is made of plastic; The four air gaps of the first lens to the fifth lens on the optical axis are summed to Gaa, and the air gap from the third lens to the fourth lens on the optical axis is G34, and the following conditional expression is satisfied: Gaa/ G34≦4. The optical imaging lens according to claim 1, wherein the optical imaging lens has a system focal length of EFL, and the second lens has a center thickness on the optical axis of T2 and satisfies the following conditional formula: EFL/T2≦9.7. The optical imaging lens of claim 2, wherein the further satisfying Column conditional formula: Gaa/T2≦2.0. The optical imaging lens of claim 3, wherein the object side of the second lens further has a concave portion located in a region near the optical axis. The optical imaging lens according to claim 2, wherein the fifth lens has a center thickness on the optical axis of T5 and satisfies the following conditional expression: Gaa/T5≦2.1. The optical imaging lens according to claim 5, wherein the following conditional expression is further satisfied: Gaa/G34≦2. The optical imaging lens according to claim 1, wherein the optical imaging lens has a system focal length of EFL, and the second lens has a center thickness on the optical axis of T2 and satisfies the following conditional formula: EFL/T2≦9.7. The optical imaging lens of claim 7, wherein the four air gaps on the optical axis from the first lens to the fifth lens are summed to Gaa, and the minimum thickness of the center of the optical axes on the optical axis is CTmin. And satisfy the following conditional formula: Gaa/CTmin≦2.5. The optical imaging lens according to claim 8, wherein an air gap from the third lens to the fourth lens on the optical axis is G34, and the following conditional expression is satisfied: EFL/G34 ≦ 7.5. The optical imaging lens according to claim 1, wherein the optical imaging lens has a system focal length of EFL, an air gap from the third lens to the fourth lens on the optical axis is G34, and satisfies the following conditional formula: EFL /G34≦11. The optical imaging lens of claim 10, wherein a thickness of the first lens to the fifth lens on the optical axis is ALT, from the first The four air gaps of the lens to the fifth lens on the optical axis are summed to Gaa, and satisfy the following conditional formula: 3.1 ≦ ALT / Gaa. The optical imaging lens according to claim 11, wherein the second lens has a center thickness on the optical axis of T2 and satisfies the following conditional formula: 7 ≦ EFL / T2 ≦ 9.7. An electronic device comprising: a casing; and an image module mounted in the casing, and comprising an optical imaging lens according to any one of claim 1 to claim 12, The optical imaging lens is provided with a lens barrel, a module rear seat unit for the lens barrel, and an image sensor disposed on the image side of the optical imaging lens.